From: Gihun Nam <gihun.nam@outlook.com>
Date: Mon, 27 Nov 2023 02:54:20 +0000 (+0900)
Subject: hw/avr/atmega: Fix wrong initial value of stack pointer
X-Git-Tag: v8.2.0-rc2~1^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=235948bf53860a1e2df5134eae7b0a30a971a124;p=thirdparty%2Fqemu.git

hw/avr/atmega: Fix wrong initial value of stack pointer

The current implementation initializes the stack pointer of AVR devices
to 0. Although older AVR devices used to be like that, newer ones set
it to RAMEND.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1525
Signed-off-by: Gihun Nam <gihun.nam@outlook.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <PH0P222MB0010877445B594724D40C924DEBDA@PH0P222MB0010.NAMP222.PROD.OUTLOOK.COM>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---

diff --git a/hw/avr/atmega.c b/hw/avr/atmega.c
index a34803e6427..31c8992d750 100644
--- a/hw/avr/atmega.c
+++ b/hw/avr/atmega.c
@@ -233,6 +233,10 @@ static void atmega_realize(DeviceState *dev, Error **errp)
 
     /* CPU */
     object_initialize_child(OBJECT(dev), "cpu", &s->cpu, mc->cpu_type);
+
+    object_property_set_uint(OBJECT(&s->cpu), "init-sp",
+                             mc->io_size + mc->sram_size - 1, &error_abort);
+
     qdev_realize(DEVICE(&s->cpu), NULL, &error_abort);
     cpudev = DEVICE(&s->cpu);
 
diff --git a/target/avr/cpu.c b/target/avr/cpu.c
index 44de1e18d1a..999c010dedb 100644
--- a/target/avr/cpu.c
+++ b/target/avr/cpu.c
@@ -25,6 +25,7 @@
 #include "cpu.h"
 #include "disas/dis-asm.h"
 #include "tcg/debug-assert.h"
+#include "hw/qdev-properties.h"
 
 static void avr_cpu_set_pc(CPUState *cs, vaddr value)
 {
@@ -95,7 +96,7 @@ static void avr_cpu_reset_hold(Object *obj)
     env->rampY = 0;
     env->rampZ = 0;
     env->eind = 0;
-    env->sp = 0;
+    env->sp = cpu->init_sp;
 
     env->skip = 0;
 
@@ -152,6 +153,11 @@ static void avr_cpu_initfn(Object *obj)
                       sizeof(cpu->env.intsrc) * 8);
 }
 
+static Property avr_cpu_properties[] = {
+    DEFINE_PROP_UINT32("init-sp", AVRCPU, init_sp, 0),
+    DEFINE_PROP_END_OF_LIST()
+};
+
 static ObjectClass *avr_cpu_class_by_name(const char *cpu_model)
 {
     ObjectClass *oc;
@@ -228,6 +234,8 @@ static void avr_cpu_class_init(ObjectClass *oc, void *data)
 
     device_class_set_parent_realize(dc, avr_cpu_realizefn, &mcc->parent_realize);
 
+    device_class_set_props(dc, avr_cpu_properties);
+
     resettable_class_set_parent_phases(rc, NULL, avr_cpu_reset_hold, NULL,
                                        &mcc->parent_phases);
 
diff --git a/target/avr/cpu.h b/target/avr/cpu.h
index 8a178627378..7960c5c57a8 100644
--- a/target/avr/cpu.h
+++ b/target/avr/cpu.h
@@ -145,6 +145,9 @@ struct ArchCPU {
     CPUState parent_obj;
 
     CPUAVRState env;
+
+    /* Initial value of stack pointer */
+    uint32_t init_sp;
 };
 
 /**